Campaign Mode

Resident Evil: Operation Raccoon City is set during the T-Virus outbreak in September of 1998, during the time period seen in Resident Evil 2 and Resident Evil 3: Nemesis.

You play as one of the members of the elite Umbrella Security Service and are tasked with destroying any evidence linking Umbrella to the T-Virus outbreak ravaging the city as well as eliminating any survivors. In addition to fighting zombies and various other bio-organic weapons created by Umbrella, you must also contend with a U.S. Special Forces team which has been deployed to contain the outbreak as well.

The campaign mode can be played either as a solo player (assisted by AI controlled teammates) or online with other players. According to how well the player does he will receive a grade from D to S+. However it's only possible to achieve a S+rank when playing in the veteran or professional difficulty.